Are we assuming Doom is around Genis level proficiency with the Nega Bands? If not, he's screwed on life one, as none of the other powers (besides the magickal powers of prep time) would harm DD in the slightest. With Genis's power, he can probly kill him the first time, only for DD to return for round 2 immune to whatever Doom can throw at him and curbstomp him. Human Torch? Invisibility? Friggin Havok plasma? DD will sit and laugh at them. Or eat them. And yes, I mean somehow shape the energy into matter and eat it. Mags and Genis are the only 2 semi useful offensive capabilities (healing factors are cool, but it won't save him). Mags is simply not powerful enough to put down DD, and he will be immune to Genis's bands by the end of the first round. That's assuming Doom has been using them for a while. Even he won't get them to work very well overnight, it took Genis YEARS. And he's still a novice compared to what he could do with them.